I have a CD of Noseda doing M7 with the BBC Phil. (Manchester) that came with a BBC Magazine a while back. It's really good and I think it was performed in Royal Festival Hall. In fact, it's among my very favorite recordings of the work.
Chailly and Leipzig doing M6 should, quite obviously, be a winner as well.
Interesting putting the 'Wayfahrer' songs on with Tchaik's "Manfred" Symphony, as Manfred is sort of a proto-Mahler work to begin with. Mahler himself conducted "Manfred" in St. Petersburg (someplace else too).